Index: Makefile
===================================================================
--- Makefile	(revision 496395)
+++ Makefile	(working copy)
@@ -24,6 +24,12 @@
 
 OPTIONS_DEFINE=	DOCS
 
+post-patch:
+.if exists(/usr/lib/libstdc++.so)
+	${REINPLACE_CMD} -e '/^#pragma GCC diagnostic/d' \
+		${WRKSRC}/src/lxml/etree.c ${WRKSRC}/src/lxml/objectify.c
+.endif
+
 post-install:
 	${FIND} ${STAGEDIR}${PYTHONPREFIX_SITELIBDIR} \
 	-name '*.so' -exec ${STRIP_CMD} {} +